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6-3
TABLE 6.1 PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR ATN PS-15
(CONT.)
Item
No.
Interval
Location Item to
Check/Service
Procedure
Not functioning at
optimal level If
Before/After
Battery Adapter /
Compartment
Check to make sure battery adapter
and inspect for corrosion, moisture,
corroded or defective contacts, and
that o-ring is present.
Adapter is missing,
contacts damaged or
corroded, or o-ring is
missing.
Before/After
Diopter Adjust-
ring to
make sure the eyepiece is not too tight
or too loose.
Binding, not moving
freely or too loose.
6. Before/After Eyecups
Inspect for dirt, dust, and cracked or
torn cups. Inspect for bent, broken or
improperly fitting eyecups. If neces-
sary, clean with water.
7. Before/After
Objective Lens
rings to
ensure free movement.
Binding or not moving
freely.
8. Before/After Lens Caps
Inspect for cracked, torn, or missing
lens caps.